Clamping hub



FIG. 1 is a perspective view of a clamping hub.

FIG. 2 is a first side view of a clamping hub.

FIG. 3 is a first end view of a clamping hub.

FIG. 4 is a second side view of a clamping hub.

FIG. 5 is a top view of a clamping hub.

FIG. 6 is a second end view of a clamping hub; and,

FIG. 7 is a bottom view of a clamping hub. 

CLAIM The ornamental design for a clamping hub design, as shown and described. 